The World Health Organization estimated that Yemen had over 200,000 cases of cholera.
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Former police officer Derek Chauvin was sentenced to 22.5 years in prison for the murder of George Floyd.
Barbed wire was patented by Lucien B Smith in Ohio, US.
American colonies recorded their first astronomical event after observing a lunar eclipse.
Florida, one of the confederate states, was readmitted to the Union.
North Korea sent 75,000 soldiers to invade South Korea, which would start the Korean War.
